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with mesa8 my desktop(KDE) runs really fast on my hd4770 really means REALLY.
my last catalyst test shows to my that my pc is just ILL without the radeon driver.
webM videos in firefox on youtube also run fine.

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In what way does Firefox and its webM rendering use Mesa functionality? Or was this just a side note?

Catalyst (fglrx) has massive tearing when any kind of video is played, mesa does not suffer from this problem.
(side-note: in the blob you can use the TearFree option to get rid of that tearing, I know, but then your video gets really laggy)

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Catalyst (fglrx) has massive tearing when any kind of video is played, mesa does not suffer from this problem.
(side-note: in the blob you can use the TearFree option to get rid of that tearing, I know, but then your video gets really laggy)

I think this is the job of the X.org driver (xorg-video-ati). In OSS land, you have the X.org driver named "radeon" (=mode setting, EXA acceleration, v-sync stuff) + Mesa (OpenGL). I think fglrx provides functionality of both so it can affect the video playback in Firefox.
I just don't think Mesa has anything to do with Firefox video so far. I has with WebGL. See in about:support, Graphics section. Do you have OpenGL accelerated windows there? This acceleration is disabled by default on Linux yet.
I am a Firefox bug triager, I can look at bug reports if you have filed any on bugzilla.mozilla.org.

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I think this is the job of the X.org driver (xorg-video-ati). In OSS land, you have the X.org driver named "radeon" (=mode setting, EXA acceleration, v-sync stuff) + Mesa (OpenGL). I think fglrx provides functionality of both so it can affect the video playback in Firefox.
I just don't think Mesa has anything to do with Firefox video so far. I has with WebGL. See in about:support, Graphics section. Do you have OpenGL accelerated windows there? This acceleration is disabled by default on Linux yet.
I am a Firefox bug triager, I can look at bug reports if you have filed any on bugzilla.mozilla.org.

It depends how the video is rendered and whether there is a compositor running or not. If there is a compositor running, it is the compositors job to avoid tearing since it controls updates to the scanout buffer. If there is no compositor running, then it depends on how the video is rendered. If the video app is using GL to render, it would work similarly to the compositor case (the GL app rendering the video would handle it). If the app is using Xv, then the ddx (xf86-video-ati, etc.) can attempt to avoid tearing.

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Thanks, that is similar to what I was saying. That compositor is not part of Mesa. And it depends more on the X.org driver. As we are talking specific application here, Firefox, it does not use OpenGL for video. Something like mplayer -vo gl2 would use it.

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Thanks, that is similar to what I was saying. That compositor is not part of Mesa. And it depends more on the X.org driver. As we are talking specific application here, Firefox, it does not use OpenGL for video. Something like mplayer -vo gl2 would use it.

its much more simple: mesa/radeon works perfekt for me with kde4.8+firefox and catalyst does NOT!